Multiple section reversible plough

ABSTRACT

A reversible plough to be towed behind a propelling vehicle has a forward section with a number of pairs of reversible plough bodies and a rear section also having a number of reversible plough bodies. The forward section and rear section are coupled together by a connection portion. A wheelset is mounted to the connection portion and is arranged to support a rear end of the forward section and a forward end of the rear section. A headstock rotatably mounts the forward end of the rear plough to the connection portion and is adjustable in order to vary the inclination of the axis of the rear plough beam to adjust the rear section between a ploughing position and an inoperative transport position. A mounting bracket connected to the forward plough beam of the forward section is rotatably mounted on the connecting frame portion.

This invention relates to a multiple section reversible plough whichcomprises a forward section which is adapted to be coupled with the rearend of a propelling vehicle, a rear section, and a wheel set whichsupports a rear end of said forward section and also supports a forwardend of said rear section, and in which the forward and rear sectionshave plough beams carrying sets of reversible plough bodies.

Multiple section reversible ploughs of this type are known e.g. fromGB2264216 or WO94/24842, and the plough beams of each section take-up afirst position for ploughing in one direction, and then are rotatedabout a generally horizontal axis through about 180°, to take up asecond ploughing position for ploughing in a reverse direction. In thefirst ploughing position, a lowermost one of each pair of reversibleplough bodies engages the ground, but upon plough body reversal, byrotation of each plough beam through approximately 180°, what waspreviously the uppermost plough body of each pair is now moved to alowermost position, for ploughing in the reverse direction.

The reversal of plough bodies of a multi-section reversible plough willbe well known to those of ordinary skill in the art, and need not bedescribed in more detail herein.

The wheel set which supports the rear end of the forward section, andalso the forward end of the rear section, may be incorporated in anintermediate plough frame section, which is located between, and whichinterconnects the forward and rear sections. The intermediate sectionmay have its own set of reversible plough bodies, but more usually theintermediate section forms a relatively short length rearwardprolongation of the forward plough section, and without any ploughbodies.

It is known to provide a transverse pivot axis i.e. a substantiallyhorizontal axis when the plough is on level ground, and which extendsgenerally perpendicular to the direction of forward travel of themultiple section combination, and in which this transverse pivot axis islocated between the rear end of the intermediate section and the forwardend of the rear section, and which allows pivotal inclination of therear section to be adjusted about this axis to suit requirements.

In a semi-mounted reversible plough, it is usual to provide a headstockat the forward end of the forward section, and which forms part of thefixed structure of the plough frame to be coupled with the usualthree-point linkage at the rear of a tractor, and to provide a meanswhereby the plough beam of the forward section can pivot throughapproximately 180° relative to the headstock at the forward end of theplough beam in order to reverse the plough bodies.

It is also known to provide an arrangement whereby the plough beam ofthe rear section can rotate through approximately 180° relative to itsmounting on the rear end of the intermediate section, in order toreverse its plough bodies.

The invention is concerned with a novel arrangement of a wheel-setsupporting portion of a multiple section reversible plough, in whichthis new arrangement provides an improved means of adjusting the rearsection simultaneously with adjustment of the forward section.

A reversible plough according to the invention is defined in claim 1.

Preferred aspects of the invention are set out in claims 2 to 10.

A preferred embodiment of multiple section reversible plough accordingto the invention will now be described in detail, by way of exampleonly, with reference to the accompanying drawings, in which:

FIG. 1 is a perspective view, from the non-ploughing side, of a multiplesection semi-mounted reversible plough according to the invention;

FIG. 1A is a detail view, to an enlarged scale, showing a pivot couplingat the rear end of a forward section of the plough and which permitspivotal adjustment of the forward section for plough body reversal;

FIG. 1B is a detail view, to an enlarged scale, of a pivot coupling atthe forward end of the forward section for plough body reversal, andalso showing means for lateral adjustment of the forward end of thesection;

FIG. 1C is a detail plan view, corresponding to FIG. 1A;

FIG. 2 is a plan view corresponding to FIG. 1;

FIG. 3 is a side view;

FIG. 4 is a detail side view of part of a headstock assembly provided ata connection portion of the plough frame between the forward and rearplough sections;

FIG. 5 is a detail view of a spring-loaded actuator cylinder arrangementfor operating the assembly shown in FIG. 4; and,

FIG. 6 is a schematic plan view, similar to FIG. 2, illustratingschematically a hydraulically controlled adjustment arrangement foradjusting the width between successive ploughshares of both the forwardand the rear sections simultaneously.

Referring now to the drawings, there will now be described a preferredembodiment of multiple section semi-reversible plough according to theinvention, and which comprises a forward section, a rear section, and awheel set which supports the rear end of the forward section, and alsosupports the forward end of the rear section. In the illustratedembodiment, the wheel set is incorporated in an intermediate framesection, which interconnects the rear end of the forward section, andalso the forward end of the rear section. However, this is one exampleonly, and a multiple section reversible plough according to theinvention may be formed by a forward section and a rear section only,and with the wheelset being mounted on a connecting portion of theoverall frame of the plough, and which supports the rear end of theforward section, and also the forward end of the rear section.

The construction and operation of a semi-mounted reversible plough willbe well known to those of ordinary skill in the art, and therefore neednot be described in detail herein. The multiple section reversibleplough according to the invention is designated generally by reference200, and comprises a forward section 201 and a rear section 202, and awheel set 203 is mounted on a part of the general fixed frame of theplough in order to support the rear end of the forward section 201, andalso to support the forward end of the rear section 202. In theillustrated embodiment, the wheelset 203 is mounted on an intermediateframe section 204, which is an A-frame as seen in plan (FIG. 2).

The forward section 201 has a plough beam 205, and the rear section 202has a plough beam 206, and each plough beam has a number of pairs ofreversible plough bodies 207 arranged along its length, and the forwardplough beam 205 is adjustably mounted at its forward end in order tocarry out rotational adjustment through approximately 180° about ageneral longitudinal axis of the forward section 201 (substantiallyparallel to the ground surface), under the action of a hydrauliccylinder (not shown) in order to reverse the plough bodies i.e. in orderto move an upper inoperative plough body of each pair in one workingposition so as to take-up a lower ploughing position in an alternativeworking position, when it is desired to reverse the plough bodies e.g.after completing one working pass along a field, and prior to carryingout a reverse pass along the field alongside the previously ploughedarea. The pivot axis about which the plough beam 206 can rotate isdefined by the longitudinal axis of a main frame beam 214 of the forwardsection 201.

The plough beam 206 of the rear section 202 also is capable of beingrotated through approximately 1800 about a general longitudinal axis ofthe rear section, for the purpose of reversing the plough bodies, but inthis case the pivot axis extends generally parallel to the ploughingdirection. The means whereby the rear plough beam 206 can be rotatedsimultaneously with rotation of forward plough beam 205 will bedescribed in more detail below.

The forward end 208 of forward section 201 is adapted to be mounted onpull bars (not shown) of a three-point linkage of a tractor viadragshaft 209, and is also coupled with the top linkage in known manner,to enable plough 200 to be "semi-mounted" at the rear of a tractor orother propelling vehicle.

The intermediate frame portion 204 is supported by wheel set 203, andwhich comprises a pair of wheels 210 mounted on a common verticallyadjustable axle 211, and which are vertically adjustable relative to theframe portion 204 via vertically adjustable support columns 212 whichare movable within fixed supports 213. The columns 212 and supports 213may be incorporated within a support cradle type of structure as shownand described in more detail in GB patent application No 9526530.2,filed Dec. 22, 1995, and the disclosure, of which is incorporated hereinby reference.

Upward and downward adjustment of the axle 211 relative to the frameportion 204 allows the height of the rear end of the forward section 201to be adjusted, and also allows the height of the forward end of therear section to be adjusted.

As mentioned above, the forward section 201 has a main frame beam 214which defines the general longitudinal axis of the forward section, andon which plough beam 205 is rotatably mounted for movement between aright-side ploughing position (as viewed from the rear) as shown in FIG.1, to a left-side ploughing position (not shown) upon reversal of theplough. The longitudinal pivot axis of the forward section 201 isdefined by a forward pivot mounting 215, and also by a rear pivotmounting 216. The forward pivot mounting 215 rotatably mounts atransverse support arm 217 which is slidably connected to a forward endof plough beam 205, and the rear end of plough beam 205 is carried by arotatably mounted support bracket 218. The bracket 218 is rotatablerelative to rear pivot mounting 216, so that arm 217 and bracket 218allow the plough beam 205 to be rotated through approximately 1800 aboutthe general axis 214a (see FIG. 2) of frame portion 214 via front andrear pivot mountings 215 and 216.

The construction of the forward pivot mounting 215 can be seen clearlyin FIGS. 1 and 2 of the drawings, and allows forward pivot arm 217 topivot about the general longitudinal axis of frame portion 214. Inaddition there is a slidably adjustable connection between pivot arm 217and the plough beam 205, as shown in FIG. 1B, and this allows lateraladjustment of plough beam 205 relative to frame beam 214 under theaction of adjusting cylinder 310 which acts between flanges 311 and 312mounted on arm 217 and beam 205 respectively.

However, the construction and mounting assembly of adjusting bracket 218via its mounting on the rear pivot mounting 216 is more complicated,since not only does rear pivot mounting 216 permit rotating movement ofthe bracket 218 and the rear end of plough beam 205 about the generalaxis of frame beam 214, but it also serves to transmit rotary adjustmentmovement to the rear plough beam 206 of the rear plough section 202, viaa shaft/universal joint drive train (316, 319, 320, 321) which isdescribed in more detail below with reference to FIG. 1A and FIG. 4.

It will be appreciated that, upon plough body reversal, not only willeach plough beam 205 and 206 be rotated through approximately 180°, butin addition relative lateral adjustment of the forward and rear ploughsections will take place, relative to the dragshaft 209. Thus, as can beseen in the plan view of FIG. 2, the plough beams 205 and 206 extendgenerally parallel to each other, and obliquely at an angle a withrespect to the ploughing direction X, but upon adjustment of the ploughbodies 205 and 206, to reverse the plough bodies, the entire ploughassembly pivots about a generally vertical axis and moves laterallyrelative to the dragshaft 209, so that plough frame portion 214, andplough beams 205 and 206 then take-up a position, as seen in plan, whichis inclined with respect to the ploughing direction X at angle β, asshown in the detail illustration schematically on FIG. 2. The frame beam214 therefore pivots relative to its forward end mounting, and carriesout lateral displacement which is automatically followed by theconnecting frame portion 204 and its supporting wheelset 203 duringturning movement of the tractor and multiple section plough in the usual"headland" prior to a reverse ploughing operation.

Therefore, the rear pivot coupling 216 has to be designed so as to becapable of permitting this translational adjustment movement duringplough body reversal, and also permitting rotational adjustment ofplough beam 205, and transmission of rotary adjusting movement also tothe forward end of rear plough beam 206, in a manner to be described inmore detail below.

The rear pivot mounting 216 will therefore now be described in moredetail. Essentially, it performs a dual function, namely: (a) it allowsadjusting bracket 218 to rotate about the longitudinal axis 214a offrame beam 214; and, (b) it transmits rotary drive (via the rotary drivetrain 316, 319, 320, 321) to adjust the forward end 220 of rear ploughbeam 206 to rotate through approximately 180°, to reverse the ploughbodies of the rear section 202.

Referring now in particular to FIG. 1A, this shows the construction ofthe forward pivot mounting 216 in more detail. The rear end of mainframe beam 214 includes a vertical connecting plate 300, having a bush301 welded to it. A bearing pin 303 is received within a sleeve bearingwithin the bush 301, and bearing pin 303 is carried by a connecting part302 which may be a compact block with an integrated journal pin (303). Agroove is formed in one end of the bearing pin 303, and the pin 303 issecured against axial movement via a stop ring 304 which fits into thegroove.

During forward movement of the plough 200, the traction force of thepropelling vehicle is transmitted through the dragshaft 209 and then tothe main frame beam 214. Traction is then transmitted to the followingparts of the multiple section plough via the frame beam 214, stop ring304, and connecting part 302.

The connecting part 302 is pivotally connected to adjusting bracket 218via a vertical pivot pin (not shown, but whose pivot axis is shown byreference 305) which is taken through aligned holes 306 formed in upperand lower plates of the bracket 218, and also is taken through avertical bore in the connecting part 302. The connecting part 302therefore can pivot about the axis 305 during the lateral adjustingmovement of frame beam 214 which takes place during plough body reversalwhen the tractor and plough combination is turning in the usual"headland" before carrying out a return ploughing action through thefield. The plough beam 205 is pivotally connected at its rear end to theadjusting bracket 218, via a vertical pivot pin (not shown) takenthrough mounting holes 308 formed in the bracket 218.

As shown in FIG. 6, and as will be described in more detail later,adjusting rods 237 extend alongside each of the plough beams 205 and206, and are connected pivotally to mounting brackets which carry theplough bodies 207, and operation of the rods 237 provides pivotableadjustment of the brackets relative to the plough beams, to providenecessary adjustment of the plough bodies. The adjusting rod 237associated with forward plough beam 205 is pivotally connected to theadjusting bracket 218 via a vertical pivot pin taken through mountingholes 307 formed in the bracket 218.

Referring again now to FIG. 1B, the forward end of the plough beam 205is slidably connected to pivot arm 217, and lateral pivotal adjustmentof plough beam 205 relative to main frame beam 214 can take place aboutthe pivotal connection (308) at the rear end of the plough beam 205under the action of adjusting cylinder 310.

When the plough has been adjusted to take-up a new ploughing position,the pivot mounting 216 is rigid in the sense that it prevents relativevertical movement between the forward section 201 and the rear section202. However, it is possible to carry out joint adjustment movement ofthe plough beam 205 and the main frame beam 214 laterally, under thecontrol of a hydraulically operated adjusting mechanism which will bedescribed in more detail below, with reference to FIG. 6. Briefly, itwill be mentioned at the moment that main frame beam 214 can pivot aboutthe axis 305 and plough beam 205 can pivot about the axis of themounting holes 308 during this adjustment. Furthermore, the adjustingrod 237 associated with forward plough beam 205 can pivot about the axisof the mounting holes 307.

The rear section 202 of the plough, having rear plough beam 206 andassociated actuator rod 237, can be adjusted in the same manner underthe action of slave cylinder 220, which also will be described in moredetail below with reference to FIG. 6.

Returning now to the construction of adjusting bracket 218, this ispivotally mounted on the connecting frame portion 204 via the pivotmounting 216, and in particular by pivotally mounting the bracket 218 ona mounting bracket assembly 315 which is rigidly mounted on one of thebeams 204a of the connecting frame portion 204. The bracket assembly 315comprises longitudinally spaced mounting plates 315a and 315b, welded tobeam 204a, and between which there extends a sleeve 315c which is weldedat each end to the plates 315a and 315b. The sleeve 315c mounts bearingsinternally at each end thereof, and a shaft 318 is mounted within sleeve315. The shaft 318 is taken through the sleeve 315, its forward end liesadjacent to but is not connected with the connecting part 302. However,its rear end is coupled with a universal joint 316 which forms part of arotary drive train for transmitting rotation to the forward end 220 ofthe rear plough beam 206, via a rotary coupling provided internally ofthe headstock 223. The universal joint 316 may be of standardconstruction, and is welded to a plate 317 which, in turn, is bolted tothe adjusting bracket 218. The axle 318 therefore extends through thesleeve 315, and is mounted rotatably therein via the internal bearingsin the sleeve 315, but also axle 318 extends axially beyond the plates315a and 315b, as can be seen in FIG. 1C, so as to be mounted in aU-shaped mounting bracket 218a which is rigidly secured to the adjustingbracket 218. Therefore, adjusting bracket 218, plate 317, universaljoint 316 and axle 318 are coupled rigidly together, so as to bepivotable together as a unit during rotary adjustment of bracket 218during plough body reversal.

Thus, when the forward section 201 undergoes plough body reversal, theplough beam 205 rotates about the axis 214a of the frame beam 214, viaforward pivot coupling 215 and rear pivot coupling 216, and this causesadjusting bracket 218 to rotate about the axis of axle 318. The rearpivot mounting 216 therefore allows this pivotable adjusting movement ofthe forward plough beam 205 for the purposes of plough body reversal,but in addition the pivot mounting 216 also allows a separate rotarydrive train to cause simultaneous rotation of rear plough beam 206 aboutan axis which extends generally parallel to the ploughing direction X,and substantially parallel to the ground surface, via a rotatablecoupling between the forward end 220 of the plough beam 206 and theheadstock 203. This rotary drive train will now be described in detailwith reference to FIG. 4. The rotary drive train therefore includes asplined axle 319 which is coupled with the universal joint 316, andwhich is axially slidable within a splined socket within a rearuniversal joint 320. The rear universal joint 320 is secured to an axle321 which extends internally of the headstock 223, and a mountingbracket at the forward end 220 of the rear plough beam 206 is coupledwith axle 321. Therefore, rotation of adjusting bracket 218 throughapproximately 180° about the axis of the axle 318 causes correspondingpivotal adjustment of the mounting bracket which carries the forward end220 of the rear plough beam 206, so that simultaneous plough bodyreversal adjustment takes place.

The headstock 223 can be of any suitable construction, and indeed may beof standard design. However, instead of using a standard type of"turn-over linkage" for the purposes of plough body reversal, there isinstead provided the rear universal joint 320, axle 321, and a slide 322by means of which a mounting bracket at the forward end 220 is fastenedby clamping with bolts.

The splined interconnection between axle 319 and rear universal joint320 permits the headstock 223 to carry out a pivotal adjustment aboutits lower pivot axis 223a (FIG. 4) under the action of adjustingmovement of top link 225, which is described in more detail below. Thus,the distance L between the forward universal joint 316 and the rearuniversal joint 320 can be allowed to vary, during adjustment of theinclination of the axis of the rear plough beam 206 under the action ofthe headstock 223, and in particular when the rear section 202 is liftedto the transport position.

As can be seen in the plan view of FIG. 2, the connecting frame portion204 effectively comprises an A-frame, and this forms a rigid supportplatform which is supported at its rear end by the wheelset 203, and itsforward end is coupled with the rear end of the forward section 201 viapivot mounting 215, and bracket 218. The headstock 223 is mounted on twoinclined beams 204a of the A-frame 204 via a pair of laterally spacedrigid supporting brackets 224, and these give structural support for theheadstock 223, and in particular give firm lateral support. This is animprovement over previous proposals, involving the use of a pair oflower pivoted links. Although not shown in the drawings, the rear end ofplough beam 206 will be supported by a trailing ground wheel.

The headstock 223 is coupled with an adjustable length top link 225,which allows the inclination to the vertical of the headstock 223 to beadjusted, for the purposes of adjusting the inclination of the axis ofrear plough beam 206.

The adjustment of the top link 225 is under the control of a hydrauliccylinder, but there is also a spring-loading of this adjustment, theconstruction and operation of which will now be described with referenceto FIGS. 4 and 5. Also, FIG. 4 shows the adjusting bracket 218 in amiddle (transport) position between left side and right side ploughing.For convenience, the spring loading detail is omitted from FIG. 4, butis shown in more detail in FIG. 5. The headstock 223 is thereforepivotally adjusted through a relatively small angle either side of thevertical plane, under the combined action of a spring arrangement, andalso an actuator cylinder. The actuator cylinder is shown by reference226, but the cylinder 226 will only be actuated when it is required toraise the plough beam 206 of the rear section to a transport position.During normal ploughing operation, the ploughing depth of the ploughbodies 207 is controlled by the vertical adjustment of the wheels 210 ofthe wheelset 203 at the forward end of the rear section 202, and also bythe depth control wheel at its rear end. A limited degree of "floating"movement is permitted, against spring pre-loading, by reason of theclearance between an adjustable stop 227 and the mounting bracket 228.Compression springs 229 therefore give spring loading to the assembly,and therefore apply compressive thrust via the cylinder 226 and the link225 to the upper end 230 of the headstock 223 and which tends tomaintain the plough bodies 207 at the right depth in the ground, evenwhen the plough section is moving through undulating ground.

However, when it is required to raise the rear plough beam 206 under theaction of the cylinder 226, the clearance between adjustable stop 227and bracket 228 is first taken-up, and then further retraction of thecylinder 226 applies a pulling force to the upper end 230 of theheadstock 223 so that the latter pivots in an anti-clockwise direction,about its lower pivot shown in FIG. 4, in order to raise the rear ploughbeam 206.

With regard to the vertical adjustment of the forward end of rear ploughbeam 206, this is obtained by vertical adjustment of the wheels 210 ofthe wheelset 203, and conveniently slide bearings with the supports 213permit relative vertical movement of the support columns 212. Hydraulicactuating cylinder (not shown) may be provided to carry out thisnecessary vertical adjustment of the wheels.

In addition to the new arrangement shown in the drawings providing jointactuation of the forward and rear plough beams 205 and 206, to carry outplough body reversal, the preferred embodiment of the invention also hasa hydraulically controlled adjusting arrangement for providing jointadjustment of the ploughing widths between successive plough bodies, ofboth the forward and the rear sections. Referring now to FIG. 6, this isa plan view, generally corresponding with FIG. 2, but includingschematic illustration of a hydraulically controlled adjusting mechanismfor adjusting the ploughing widths between successive plough bodies.

As shown in FIG. 6, the ploughing width i.e. the lateral spacing betweensuccessive ploughshares (successive shares being measured in a directionparallel to the ploughing direction) is shown by reference W. ReferenceC is the distance, measured along the forward plough beam 205, betweenthe pivot point 231 of a mounting bracket 232 and the pivot point 233 ofthe plough beam 205 on bracket 218, whereas distance D is the length,measured along the rear plough beam 206, between forward pivot 234 offorward bracket 220 on which the forward end of rear plough beam 206 ispivotally mounted and to the pivot point 235 of mounting bracket 236.

The pairs of plough bodies 207 are carried by respective mountingbrackets which are pivotally mounted on the respective plough beams, inknown manner, and which are coupled together for joint adjustment underthe action of adjusting rods 237, pivoted to the mounting brackets.Evidently, lengthwise adjustment of the rods 237 will cause pivotaladjustment of the mounting brackets which will each pivot through thesame angle, to provide joint adjustment of all of the ploughing widthsbetween successive plough bodies. Evidently, following adjustment of thebrackets, the entire multiple section reversible plough automaticallyadjusts itself relative to the dragbar 209, so that the plough bodiesalign themselves with the ploughing direction, and take-up a newposition of width adjustment one relative to the other.

Evidently, in a multiple section reversible plough arrangement, it willbe desirable to provide an adjustment mechanism which allows a singleinput adjustment to cause corresponding adjustment of the plough widthsof successive plough bodies of all of this plough section. A mastercylinder 238 forms part of a hydraulically operated control mechanism;and is coupled with part of the adjusting mechanism associated with theforward plough beam 205, whereas a slave cylinder 239 forms part of anadjustment mechanism which controls the adjustment of the plough bodiesof the rear plough beam 206. Therefore, upon application of suitableinput adjustment control to the master cylinder 238, this causes acorresponding adjustment of the ploughing widths between successiveplough bodies of the forward section, but the same adjustment movementis transferred to the slave cylinder 239, which causes the same extentof adjustment movement of the width between successive plough bodies ofthe rear section.

The master cylinder 238, and slave cylinder 239 can each be consideredto form part of an imaginary triangle, shown by hatched representationsA and B in FIG. 6, such triangles being of equal size and equal shape.The geometry of the arrangement on the front part is identical to thegeometry on the rear part, and with the lengths C and D being equal, theangles of the front plough beam 205 and the rear plough beam 206 willalways be maintained equal to each other.

In the illustrated embodiment of the invention, a set of three pairs ofreversible plough bodies is provided on the front plough beam 205, and asimilar number of pairs of plough bodies may be provided on the rearplough beam 206. However, it should be understood that the number ofpairs of plough bodies is not critical to the invention, if a greaternumber of pairs of plough bodies is required, then is a simple mattermerely to increase the length of either or both of the plough beams 205and 206. The wheelset 203 supports the rear end of the forward section201, and also supports the forward end of the rear section 202, and mostconveniently this is achieved by providing connecting frame portion 204.The wheelset 203 is arranged at or near to the rear end of theconnecting frame portion 204, whereas the pivot mounting assembly (216)which rotatably mounts the forward plough beam 205 of the forwardsection 201, is mounted at the forward end of connecting frame portion204.

What is claimed is:
 1. A reversible plough which is intended to bemounted on and towed behind a propelling vehicle and which comprises:aforward section having a forward plough beam provided with a number ofpairs of reversible first plough bodies spaced apart along the forwardplough beam, said forward plough beam having a forward end which isadjustably mounted in order to move an upper inoperative portion of thefirst plough bodies to a lower ploughing position in order to reversethe first plough bodies; a rear section having a rear plough beamprovided with a number of pairs of reversible second plough bodiesarranged along the rear plough beam, said rear plough beam having aforward end which is adjustably mounted to move an upper inoperativeportion of the second plough bodies to a lower ploughing position inorder to reverse the second plough bodies; a wheelset arranged tosupport a rear end of said forward section, and also to support aforward end of said rear section; a connecting frame portion whichinterconnects said forward section and said rear section, said frameportion having said wheelset mounted thereon; means for rotatablymounting the forward end of the rear plough beam to the connecting frameso as to permit rotation of the rear plough beam through an angle ofapproximately 180° in order to reverse the second plough bodies, and forvarying the inclination of the rear plough beam to adjust the rearsection between a ploughing position and an inoperative transportposition, said connecting frame comprises a pair of separate supportbeams on which said means for rotatably mounting the forward end of therear plough is mounted via respective securing brackets; a mountingbracket connected to said forward plough beam of the forward section,said bracket being rotatably mounted on said connecting frame portion toallow said forward plough beam to be rotated through approximately 180°in order to reverse the first plough bodies; and, means for rotatablymounting said bracket on said connecting frame portion and alsoproviding a drive coupling to the forward end of said rear plough beam,whereby joint adjustment rotation of said forward plough beam and saidrear plough beam can take place in order to reverse the plough bodies ofthe forward and rear sections simultaneously.
 2. A reversible ploughaccording to claim 1, in which a shaft assembly is coupled with saidmeans for rotatably mounting said bracket on said connecting frameportion.
 3. A reversible plough according to claim 2, in which saidshaft assembly includes a driveshaft and at least one universal joint.4. A reversible plough according to claim 3, in which a forward end ofthe driveshaft is coupled with said mounting bracket to be rotated bythe mounting bracket when the forward plough beam is adjusted to carryout reversal of the first plough bodies.
 5. A reversible ploughaccording to claim 4, in which said mounting bracket is coupled withsaid drive shaft via a first universal joint, and said drive shaft iscoupled via a second universal joint with a second drive shaft which ismounted in said means for rotatably mounting.
 6. A reversible ploughaccording to claim 1, in which the connecting frame portion comprises anA-frame, as seen in plan, in which the apex of the A-frame is locatedforwardly, and serves to rotatably mount said mounting bracket, and inwhich a rear end of the A-frame is supported by said wheelset.
 7. Areversible plough which is intended to be mounted on and towed behind apropelling vehicle and which comprises:a forward section having aforward plough beam provided with a number of pairs of reversible firstplough bodies spaced apart along the forward plough beam, said forwardplough beam having a forward end which is adjustably mounted in order toreverse the first plough bodies; a rear section having a rear ploughbeam provided with a number of pairs of reversible second plough bodiesarranged along the rear plough beam, said rear plough beam having aforward end which is adjustably mounted in order to reverse the secondplough bodies; a connecting frame portion which interconnects saidforward section and said rear section, the connecting frame including apair of separated support beams; a wheelset mounted to the connectingframe, the wheelset being arranged to support a rear end of the forwardsection and the forward end of the rear section; a headstock mounted tothe separated support beams via respective securing brackets, theheadstock mounting the forward end of the rear plough beam to theconnecting frame so as to permit rotation of the rear plough beamthrough an angle of approximately 180° in order to reverse the secondplough bodies, the headstock also being adjustable in order to vary theinclination of the rear plough beam to adjust the rear section between aploughing position and an inoperative transport position; a mountingbracket connected to said forward plough beam of the forward section,said bracket being rotatably mounted on said connecting frame portion toallow said forward plough beam to be rotated through approximately 180°in order to reverse the first plough bodies; and means for rotatablymounting said bracket on said connecting frame portion and alsoproviding a drive coupling to the forward end of said rear plough beam,whereby joint adjustment rotation of said forward plough beam and saidrear plough beam can take place in order to reverse the plough bodies ofthe forward and rear sections simultaneously.
 8. A reversible ploughwhich is intended to be mounted on and towed behind a propelling vehicleand which comprises:a forward section having a forward plough beamprovided with a number of pairs of reversible first plough bodies spacedapart along the forward plough beam, said forward plough beam having aforward end which is adjustably mounted in order to reverse the firstplough bodies; a rear section having a rear plough beam provided with anumber of pairs of reversible second plough bodies arranged along therear plough beam, said rear plough beam having a forward end which isadjustably mounted in order to reverse the second plough bodies; aconnecting frame portion which interconnects said forward section andsaid rear section; a wheelset mounted to the connecting frame, thewheelset being arranged to support a rear end of the forward section andthe forward end of the rear section; a headstock mounting the forwardend of the rear plough beam to the connecting frame so as to permitrotation of the rear plough beam through an angle of approximately 180°in order to reverse the second plough bodies, the headstock also beingadjustable in order to vary the inclination of the rear plough beam toadjust the rear section between a ploughing position and an inoperativetransport position; a spring loaded hydraulic actuator coupled with atop link connected to an upper end of the headstock; a mounting bracketconnected to said forward plough beam of the forward section, saidbracket being rotatably mounted on said connecting frame portion toallow said forward plough beam to be rotated through approximately 180°in order to reverse the first plough bodies; and means for rotatablymounting said bracket on said connecting frame portion and alsoproviding a drive coupling to the forward end of said rear plough beam,whereby joint adjustment rotation of said forward plough beam and saidrear plough beam can take place in order to reverse the plough bodies ofthe forward and rear sections simultaneously.
 9. A reversible ploughwhich is intended to be mounted on and towed behind a propelling vehicleand which comprises:a forward section having a forward plough beamprovided with a number of pairs of reversible first plough bodies spacedapart along the forward plough beam, said forward plough beam having aforward end which is adjustably mounted in order to move an upperinoperative portion of the first plough bodies to a lower ploughingposition in order to reverse the first plough bodies; a rear sectionhaving a rear plough beam provided with a number of pairs of reversiblesecond plough bodies arranged along the rear plough beam, said rearplough beam having a forward end which is adjustably mounted to move anupper inoperative portion of the second plough bodies to a lowerploughing position in order to reverse the second plough bodies; awheelset arranged to support a rear end of said forward section, andalso to support a forward end of said rear section; a connecting frameportion which interconnects said forward section and said rear section,said frame portion having said wheelset mounted thereon; means forrotatably mounting the forward end of the rear plough beam to theconnecting frame so as to permit rotation of the rear plough beamthrough an angle of approximately 180° in order to reverse the secondplough bodies, and for varying the inclination of the rear plough beamto adjust the rear section between a ploughing position and aninoperative transport position; a mounting bracket connected to saidforward plough beam of the forward section, said bracket being rotatablymounted on said connecting frame portion to allow said forward ploughbeam to be rotated through approximately 180° in order to reverse thefirst plough bodies; means for rotatably mounting said bracket on saidconnecting frame portion and also providing a drive coupling to theforward end of said rear plough beam, whereby joint adjustment rotationof said forward plough beam and said rear plough beam can take place inorder to reverse the plough bodies of the forward and rear sectionssimultaneously; and a spring loaded hydraulic actuator coupled with atop link connected to the means for rotatably mounting the forward endof the rear plough beam.
 10. A reversible plough which is intended to bemounted on and towed behind a propelling vehicle and which comprises:aforward section having a forward plough beam provided with a number ofpairs of reversible first plough bodies spaced apart along the forwardplough beam, said forward plough beam having a forward end which isadjustably mounted in order to move an upper inoperative portion of thefirst plough bodies to a lower ploughing position in order to reversethe first plough bodies; a rear section having a rear plough beamprovided with a number of pairs of reversible second plough bodiesarranged along the rear plough beam, said rear plough beam having aforward end which is adjustably mounted to move an upper inoperativeportion of the second plough bodies to a lower ploughing position inorder to reverse the second plough bodies; a wheelset arranged tosupport a rear end of said forward section, and also to support aforward end of said rear section; a connecting frame portion whichinterconnects said forward section and said rear section, said frameportion having said wheelset mounted thereon; means for rotatablymounting the forward end of the rear plough beam to the connecting frameso as to permit rotation of the rear plough beam through an angle ofapproximately 180° in order to reverse the second plough bodies, and forvarying the inclination of the rear plough beam to adjust the rearsection between a ploughing position and an inoperative transportposition; a mounting bracket connected to said forward plough beam ofthe forward section, said bracket being rotatably mounted on saidconnecting frame portion to allow said forward plough beam to be rotatedthrough approximately 180° in order to reverse the first plough bodies;means for rotatably mounting said bracket on said connecting frameportion and also providing a drive coupling to the forward end of saidrear plough beam, whereby joint adjustment rotation of said forwardplough beam and said rear plough beam can take place in order to reversethe plough bodies of the forward and rear sections simultaneously; and ahydraulically controlled adjustment mechanism having a master cylinderand a slave cylinder, each associated with a respective one of saidforward section and rear section, and operable jointly to apply the sameextent of widthwise adjustment of successive plough bodies of eachsection.
 11. A reversible plough according to claim 10, in which themaster cylinder is incorporated into an adjustment mechanism associatedwith the forward section, and the slave cylinder is incorporated in anadjustment mechanism coupled with the plough bodies of the rear section.